Using a covariant and angular-momentum-conserved chiral transport model, which takes into account the spin-orbit interactions of chiral fermions in their scatterings via the side jumps, we study the quark spin polarization in quark matter. For a system of rotating and unpolarized massless quarks in an expanding box, we find that side jumps can dynamically polarize the quark spin and result in a final quark spin polarization consistent with that of thermally equilibrated massless quarks in a self-consistent vorticity field. For the quark matter produced in noncentral relativistic heavy ion collisions, we find that in the medium rest frame both the quark local spin polarizations in the direction perpendicular to the reaction plane and along the longitudinal beam direction show an azimuthal angle dependence in the transverse plane similar to those observed in experiments for the Lambda hyperon.

中文翻译：

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协变角动量守恒手性传输模型中的自旋极化。

使用协方差和角动量守恒的手性输运模型，该模型考虑了手性费米子通过侧跳在其散射中的自旋轨道相互作用，我们研究了夸克物质中的夸克自旋极化。对于在扩展框中旋转和无极化的无质量夸克的系统，我们发现侧跳可以动态极化夸克自旋，并导致最终的夸克自旋极化与自平衡涡场中的热平衡无质量夸克相一致。对于非中心相对论重离子碰撞中产生的夸克物质，